Overview: Acetaminophen/codeine is used to treat certain types of pain. It reduces pain signals and changes how your body feels pain. Common side effects include constipation and feeling sleepy. Medscape - Indication-specific dosing for Tylenol with Codeine, Tylenol 3, Tylenol 4 (codeine, acetaminophen), frequency-based adverse effects, comprehensive interactions. Acetaminophen is used to relieve pain and reduce fever in patients. It does not become habit-forming when taken for a long time. But acetaminophen may cause other unwanted effects when taken in large doses, including serious liver damage. Compare Tylenol With Codeine 2 vs Tylenol With Codeine 3 head-to-head with other drugs for uses, ratings, cost, side effects and interactions. Learn about Tylenol with Codeine usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Get safe TYLENOL® dosing guidance for adults and children. Learn about recommended TYLENOL® dosages, how to read dosing charts, and how to use acetaminophen safely. Learn about Tylenol NO. 2 with Codeine uses, dosage, side effects, food interactions, and more. Get all the details about Tylenol NO. 2 with Codeine from MedicinesFAQ. Both Tylenol 3's and vicodin contain acetaminophen (APAP), an NSAID pain reliever. The more powerful ingredient in Tylenol 3 is codiene; whereas the powerful painkiller in vicodin is. As Canada's trusted pharmacy, Rexall provides detailed drug factsheets for Tylenol NO. 2 with Codeine with common uses, dosage instructions, side effects & drug interactions.